Crystal

Clear/White Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

White Salt Crystal Lamp (Halite)

Halite (Sodium Chloride, NaCl)

Diamond

Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.

Clear Quartz Crystal (Herkimer Diamond style)

Silicon Dioxide (SiO2)

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Red Quartzite (Strawberry Quartz)

Quartzite (SiO2 with iron oxide inclusions)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Druzy Agate (specifically Black Druzy Agate)

Silicon Dioxide (SiO2)

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Marble

Metamorphosed Limestone (main mineral: Calcite, CaCO3)

Desert Rose

Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt or Porphyritic Andesite

Obsidian

Volcanic Glass (SiO2, usually >70% silica content)

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

Herkimer Diamond

Double-terminated Quartz (Silicon Dioxide, SiO2)

Garden Quartz

Silicon Dioxide (SiO2) with various inclusions

Citrine

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

Green Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with Chlorite inclusions

Que Sera Stone (Llanite)

Rhyolite Porphyry with Blue Quartz and Feldspar

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Greyscale Moonstone / Silver Sheen Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Varietal of Quartz), SiO2 with traces of Iron (Fe3+)

Amethyst

Silicon Dioxide (SiO2) containing iron impurities

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)